Copyright © 2009 by B. Kohler all rights reserved
L.W.L./L.o.a. : 11,00m + rudder
Beam : 7,00m
Draft hull : 0,60m
Draft rudders up: 0,40m
Distance bridge/CWL 0,70m
Weight empty 3000 kgs
Weight C.W.L. 4300 kgs
Sail area 60,27m2
Reacher 40,00 m2
L/B hull 1:13,75
L/B to C/C 47,27%
Righting moment : 20.000,00 kgm
Construction time approx. 3000 hours
Engines recommended 2 x 13 kW Diesel engines with saildrive
Tanks water 200 l + water maker
Tanks Diesel200 l
long distance cruiser
was designed in close cooperation with a customer. He wanted a relative
big cat but for a modest amount of money, without sacrificing sea
worthiness, speed or creature comfort. I think I have meet and partly
exceeded the goal,
After the customer looked at the drawings he made the decision to built
the boat by him self, because of the simple construction. Number two
was built by a Dutch boat building company The costs for the bare boat
(without rig and furniture) dfl. 75.000,- ( in today’s
money Euro 35.000,-). This was in 1990.
How is this possible? First of course through the trapezoid hull cross
section. But the big saving is achieved by withdrawing the conventional
gunwale/ deck, cabin coaming and roof construction.
The cabin roof starts direct at the deck sheer line. Through this
construction, less material is needed and much labor is saved. The
whale deck construction is much stronger (comparable to an eggshell).
The positive effects are cumulative, for instance, more head room in
the hulls (or higher cabin sole for water tanks etc.). On the sailing
point of view, lower center of gravity i.e. greater stability, low wind
and wave resistance, almost undisturbed airflow over the roof, which means
that the lower area of the mainsail will deliver more power. The
accommodation speaks for it self. The dimensions of the bunks, seats,
bath room, galley etc, are comparable to these found at home.
The simple and high efficient rig is easy to manage from one person,
because of the self tending jib and the full battened mainsail.
Construction is the time proven wood/glass/Epoxy construction system.
The whole boat is covered with glass cloth. In this way the boat needs
less maintenance than any other construction system.
The plan consists of 28 drawings and a construction description.
The basic costs for the plan is € 800,-
Study plan Seagull ( US $ 15,-)